Year % 1995 24.15 1996 18.36 1997 19.24 1998 24.08 1999 20.44 2000 12.12 2001 12.01 2002 12.94 2004 12.53 2005 5.43 2006 2.03 2007 2.55 2008 2.69 2009 1.28 2010 1.24 2011 1.29 2012 1.03 2013 1.04 2014 0.84 2015 0.85 2016 0.97 2017 1.05 2018 1.03 2019 1.42 2020 1.31 2021 1.55